Method for recovering composite extracting agent in extraction and separation process of coal tar waste residues

The technology of a composite extractant and a recovery method is applied in the recovery field of the extractant, which can solve the problems of large extraction dose, limited popularization and use, etc., and achieves the effects of small solvent loss, cost reduction, and reduction of tar dehydration process.

Active Publication Date: 2015-11-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early stage, the research group carried out the research on the extraction and separation of coal tar waste residue by solvent extraction method. After many experiments, it was found that the composite extraction agent composed of furfural and ester solvent is an extraction agent with high separation efficiency and excellent performance. , the coal tar waste residue extraction and separation operation process using the composite extractant can be carried out under normal temperature and pressure conditions. 1 to 3 times of
If recycling is not carried out, the discharge problem of extractant is more prominent, which limits the popularization and use of this method.

Method used

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  • Method for recovering composite extracting agent in extraction and separation process of coal tar waste residues

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Experimental program
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Effect test

Embodiment 1

[0025] Under normal temperature and pressure, furfural and methyl acetate are formulated into a furfural ester composite extractant according to the volume percentage of 5% and 95%, and then the composite extractant is mixed with the coal tar waste residue J1 produced by the coking plant according to the mass ratio of 1:1 mixed in the extraction tank to obtain the mixture; under the condition of normal temperature and pressure, the above mixture was fully stirred for 0.5h, left standing for 0.5h, and then sent to the separation equipment for separation to obtain the mixed solution and solid residue; The solid slag obtained by separation is soaked twice again, the mixed solution is sent into the distillation tank, and 6.7% water of the volume of the composite extractant is added, heated to boiling, and the azeotrope containing the composite extractant and water from Volatilize from the mixed solution containing tar, condense and recover the distillate to obtain oil-water mixture...

Embodiment 2

[0029] Under normal temperature and pressure, furfural and ethyl acetate are formulated into a furfural ester composite extractant according to the volume percentage of 12% and 88%, and then the composite extractant and the coal tar waste residue J2 produced by the coking plant are prepared according to the mass ratio of Mix 2:1 in the extraction tank to obtain the mixture; under the condition of normal temperature and pressure, fully stir the above mixture for 40min, let it stand for 0.5h, and then send it to the separation equipment for separation to obtain the mixed solution and solid slag; the separation The solid slag obtained is soaked twice again, and the mixed solution is sent into the distillation tank, and the water of 17.2% of the volume of the composite extractant is added, heated to boiling, and the azeotrope containing the composite extractant and water from the Volatilize from the mixed solution of tar, condense and recover the distillate to obtain oil-water mixt...

Embodiment 3

[0033] Under normal temperature and pressure, furfural, ethyl acetate and methyl acetate were formulated into furfural ester composite extractant according to the volume percentage of 12%, 58%, and 30%, and then the composite extractant was mixed with the coal gasification process. Coal tar waste residue Q1 is mixed in the extraction tank according to the mass ratio of 2.5:1 to obtain the mixture; under the condition of normal temperature and pressure, the above mixture is fully stirred for 50 minutes, allowed to stand for 1 hour, and then sent to the separation device for separation to obtain the mixture solution and solid slag; the separated solid slag is then soaked twice, the mixed solution is sent to the distillation tank, and 11.4% of the volume of the composite extractant is added, heated to boiling, containing the composite extractant and The azeotrope of water is volatilized from the mixed solution containing tar, and the distillate is condensed and recovered to obtain...

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Abstract

The invention discloses a method for recovering a composite extracting agent in the extraction and separation process of coal tar waste residues. The method includes the steps that a mixed solution which includes the composite extracting agent and coal tar and is obtained after the coal tar waste residues are extracted and separated is fed into a distillation retort, and then water is added and heated to be boiled; the azeotrope formed by the composite extracting agent and the water is volatilized out from the mixed solution; distillate is recycled in a condensation mode so that an oil-water mixture can be obtained; the composite extracting agent and the water are obtained by standing and layering and then are returned to the system to be recycled. The method has the characteristics that the recovered temperature of a furfural and ester composite extracting agent is low, operation is safe and reliable, the handling capacity is large, solvent loss is small, and the water content of tar is lower than 3%.

Description

technical field [0001] The invention relates to a method for recovering an extractant, in particular to a method for recovering a composite extractant used in the extraction and separation process of coal tar waste residue. Background technique [0002] Coal tar waste residue is an industrial waste residue formed when high-boiling organic compounds generated under high-temperature conditions are condensed and mixed with coal powder and solid particles entrained in the gas during the gasification and coking process of coal. Coal tar waste residue contains a large amount of fixed carbon and organic volatile matter, and its calorific value is about 8000kcal / kg. Therefore, coal tar waste residue is a useful resource. However, at present, most enterprises fail to recycle and utilize a large amount of coal tar waste generated in the production process, but pile it up or discard it at will. Over time, a large amount of coal tar waste not only takes up a lot of open space and bring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 牛艳霞申峻盛清涛王雄雷刘刚刘彦荣张建文
Owner TAIYUAN UNIV OF TECH
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